Inverted incandescent mantle.



Pmenmd Apr. 23, 1918.

WITNESSES:

A TTORNE Y known to us; the

. expensive in onsAnn ennnrnfnr nan PAUL CARPENTER, OF (JI-IICAGO, ILLINOIS.

In'vna'rnn Incannnscnu'r nanrtn Application filed August 29, 1910, Serial No. 579,452.

To all whom it may concern:

Be it known that we, CESARE BARBIERI, a

" subject of the King of Italy, and a resident of Chicago, in the State of Illinois, United States of America, and PAUL Cnnrnnrrna, a citizen of the United States, and a resident of Chicago aforesaid, have invented certain new and useful Improvements in Inverted Incandescent Mantles, of which the following is a specification.

Our present invention relates to incandescent lighting mantles, and more particularly to mantles used in connection with hydro-carbon gas, and has especial reference to the provision'of an improved mantle of the so-calledincandescent type.

The principal objects of our present invention are the provision of an improved mantle characterized as above. noted which be formed from a single fiat piece of material without stitches or seams; the provision of an improved mantle wherein the hemispherical portion which is the source of the greatest volume of available light rays is of substantially uniform thickness throughout, whereby a superior volume of light and greater evenness in the quality thereof may be attained than in others provision of improved means for stiffening the mantle; the provision of improved means forattaching the mantle to the supporting base which is required in'the use of the mantle; the provision of an improved form of'supporting base adapted to hold the mantle securely, to maintain its original symmetrical form and one having simple means for the attachment of the mantle thereto; the provision of a mantle which is not only superior in light giving properties, but also most inmanufacture and may be made in extraordinarily large sizes, together with such other objects as may hereinafter appear. I

In all mantles of the inverted typekno-wn to us, the dome of which is desirably closed, closure is effected by sundry stitching and cutting operations, involving the use of expensive Inachinery, considerable hand labor and waste of material, distortion of the mantle in the course of manufacture owing to the extreme flexibility of the material of which it is made, certain complications in the method of fixing the mantle in position upon the kaolin base which supports it, and

Specification of Letters Patent.

Patented Apr. 23, rare, Renewed. September 15, 1917. Serial No. 191,630.

creases, folds, and bunching of the material making it dense and presenting lines of cleavage whereby it is weakened both in respect to light giving properties and strength at the points where greatest eliiciency as to both is desirable, not only making it expensive on account of lack of longevitybuton account of the greater quantityof gas r quired for incandescence.

In overcoming the disadvantages referred to and attaining the objects stated, as Well as certain further benefits and advantages to be below disclose-d, we havcprovided the construction illustrated in theac'companying drawing, wherein- Figure l is a plan view of textile fabric webbing used by us in the manufacture of our improved mantle; 7 Figs. 2 and 3 are respectively a plan and an elevational view of the kaolin supportingba'seused in connection with our improved mantle;

Figs. 4, 5 and 6 are respectively a top plan, an elevational, and a sectional view of the completed mantle, Fig. 6 being taken on the line drawn VI-VI of Fig. l.

Referring first to Figs. 1, 2 and 3, it is to be noted that the mantles are preferably formed from circular pieces of fabric 10 in order that the most economical use may be made of the fabric in'cutting, and to avoid waste and facilitate trimming when the mantle is put into position about the supporting base 11, .(now to be described) burned, and treated by immersion in collodion or other suitable protecting material preparatory to shipping and use in the customary manner.

Referring now more particularly to Figs.

2 and 3, it will be observed that the base 1]] comprises an annular portion 12, here shown as having a plurality of supporting armsll, the outer surface of the base being provided with a plurality of projecting por- 0f corrugations 19 which are fitted about and into the rounded portions 14 and 15 of the base, and the binding cord 17 drawn tightly th'er'eabout and into the notches, l6, and then knotted, whereby the parts of the completed mantle are firmly held from movement relatively to each other.

I It will thus be noted that we have provided a construction of mantle wherein no stitching of the fabric is required, no scams are'present to cause inequalities in the diffusion of the light, no bunching of material is present to cause strains on any portion of the mantle, no distortlon of the mantle owing to lmperfectlons 1n. sewlng 1s possible;

a one wherein practically all of the material 7 ofthe fabric is available for incandescence and a greater superficialarea of lncandes- V centsurface is presented to the action of the burning gas,one which, owing to the presence of the corrugations,is quite stiff and at the same time not so liable to breakage as those in which there are'seams, stltching or bunching, causing unequal strains on various parts of the mantle, and one which being formed from a piece of webbing having no projecting portions, may be. dipped and ironed if desired after forming, instead of before forming with much greater facility than others known to us.

It willbeparticularly noted that the dome portion 18 is entirely free from not only seams and'stitchin'g, but from all inequalities whatsoever, thus gaining the highest efliciency inlight and also avoiding the lines of cleavage along'which it is found in practice that mantles most frequently break.

Having thus described our'invention and illustrated its use, what we claim as new and desire to secure by'Letters Patent is the following:

1. As an article of manufacture, a dome shaped mantle formed from flat fabric without seams and provided with corrugations taper-mg toward the end thereof, and stopplng short of the terminal portion thereof,

(flames or this patent may be obtained for plain.

4. A mantle comprising, in combination with a supporting base and binding means, a piece of substantially flat radially corrugated fabric of substantially the same toxture throughout bent along the corrugations and bound to said base whereby a dome -shaped end is formed by such bending and binding.

5. The process of making mantles which consists in corrugating a piece of substantially fiat fabric radially, bending it along the corrugations, fastening the corrugated portion to a supporting base, and then burnin i the mantle thus formed over a formin b flame to set the fabric in its final shape.

6. As an article of manufacture, a dome shaped mantle of substantially the same teX- ture throughoutformed of a piece of substantially fiat fabric provided with stiffening corrugations tapering toward the dome.

I In testimony whereof we have hereunto signed our names in the presence of the two subscribed witnesses.

CESARE BARBIERI. PAUL CARPENTER.

Witnesses:

EVELYN O. NAYLOR, HANNA SHILLING.

five cents each, byraddressing the "Commissioner of Patents,

Washington, D. C. 

